Deploy Application on Heroku

[devukurup]

• [x] Setup Heroku deployment. Refer: https://www.bigbinary.com/learn-rubyonrails-book/deploying-application-on-heroku No need to set up Heroku pipeline. Just do it till Auto-Deployment from the book.
• [x] Update README.md with the Heroku application URL (e.g. Application URL: https://herokuappname.herokuapp.com/).